\begin{tikzpicture}
	\onslide<2->{
		\node[inner sep=0pt] (D) at (2,2)
		{\includegraphics[scale=0.35]{images/cats.png}}; 
	}
	
	\onslide<3->{
		\node[inner sep=0pt] (E) at (6,2)
		{\includegraphics[scale=0.35]{images/dogs_fin.png}}; 
	}
	\onslide<4->{ \node at (8.5,2) {\dots};}
	\onslide<5->{
		\node[inner sep=0pt] (E) at (11,2)
		{\includegraphics[scale=0.35]{images/cars.png}}; 
	}
\end{tikzpicture}